I think these article numbers prohibit the use of a cable clamp as a ground and unused cable openings as well as require workmanlike installations using parts approved for the purpose.

Please see the following in the latest NEC;
110.12
110.14

regards

greg

Greg,
No one said that the cable clamp could be used to connect the EGC to the box. I and others said that the cable clamp screw with the clamp removed could be used for that purpose.
Don

Not permitted! Absolutely not!

I never would allow the cable clamp threaded hole to be used for the termination of the EGC or EBJ!

Listed products identify that hole in metal boxes with "GR" or "GRND" and one regular reference is 110.3(B)!

Joe, the intent is to be sure that at least two threads are fully engaged. In the case of standard boxes, it makes no difference which hole is used as long as it used for no other purpose (you will find nothing in the Code or the UL White Book that prohibits this practice). Additionally, the screw from the clamp may be used if the clamp is removed.

Charlie:

I disagree, if the "GR" or "GRND" is engraved on the box, that is a simple instruction, besides the use of the clamp hole is going to be a problem, especially when the addition of another circuit may be considered when the box is of adequate size.

Intent is not what this is about, you know what you can find when Intent is discussed at a CMP meeting, a lot of wasted time.

Are you currenly involved in the inspection process? I thought I saw where you were?

Joe so you would fail this based on 110.3(B)?

So using a nut and bolt or a ground clip to terminate the grounding conductor would also be a violation?

This is the type of enforcement that makes people avoid inspections.

The clamp machine screw can (minus the clamp) can safely perform the function of grounding the box.

Being forced to change this by an inspector would only be for the inspectors amusement as it certainly is not a NEC violation.

We are discussing the hole for the clamp screw! The use of a bolt and nut or a "LISTED" clip is acceptable.

When you install cables, such as MC or AC under a clamp and terminate the EBJ (the pigtail) where do you terminate it?

If the box has the threaded hole, that's where it should be.

If there was an accident, you would not be able to satisfy the judge and jury that it was OK because you said so.

Any inspector who allows this is not doing their job.

Again, put the inspector's hat on for a while!

Joe,
As you so eloquently said it in the other thread on this same subject.

Hogwash!!

Don

[This message has been edited by resqcapt19 (edited 05-12-2004).]

Of all the things for an inspector to bitch about this would not even be on my list.

I checked some boxes today and none were marked "GR". After reading all the posts about this, I used the clamp screw In the clamp screw hole. Clamp removed of course.

[This message has been edited by Electricmanscott (edited 05-13-2004).]

How about the use of the green screw that is usually supplied with the green pigtail wire into the threaded hole originally meant for a clamp? But without the clamp. Older boxes don't have a dedicated ground threaded hole and I've used the unused hole meant for a clamp screw for the ground. The clamp screw and the ground screw are the same size and thread.

Hey on the tail of this one. Joe seems kinda one track minded to me, my or highway.I agree with Don as long as the box is properly grounded with a treaded hole clamp removed with no label grd why fail the job. The main thing is actually the box is properly grounded according to the rules we follow.

Joe T,
The 4S (or 1900) boxes I get from my wholesale house do not have any sort of marking around the threaded 10/32 hole in them... & they are UL Listed.. As far as this falling under 110.3(B) The same box with or without the GR or GND stamp can be found by different manufacturers.. (Raco, I believe has the GR mark, the ones I use are Bowers & they dont).. I don't think this marking is integral to the "listing" of the box or else they'd all have it!..

On another note, Here's a question I asked in another thread... Joe, Please look at the following photo and tell me if I should be cited under 110.3(B) for mounting this outlet "ground-down"



The word "TOP" appearing here I believe is just as integral to a listing as the "GR" mark in a metal box

JMHO

-Randy

PS.. Photo from: https://www.electrical-contractor.net/ubb/Forum5/HTML/000527.html

Edited to add the above link

[This message has been edited by Lostazhell (edited 05-25-2004).]